CN215861730U

CN215861730U - Two-stage series mechanical seal with controllable leakage

Info

Publication number: CN215861730U
Application number: CN202121505804.9U
Authority: CN
Inventors: 张丽平; 王杨; 卢波
Original assignee: Beijilian Harbin Technology Development Co ltd
Current assignee: Beijilian Harbin Technology Development Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2022-02-18
Anticipated expiration: 2031-07-02

Abstract

The utility model relates to a two-stage series mechanical seal with controllable leakage, which comprises a pump shell, a shaft, a movable ring outer ring, a check ring, a round nut, a snap ring, a shaft sleeve, a primary fixing ring, a movable ring, a stationary ring outer ring, a stationary ring seat, a seal body, a secondary fixing ring, a water retaining ring cover and a seal cover.

Description

Two-stage series mechanical seal with controllable leakage

Technical Field

The utility model relates to the technical field of mechanical seals, in particular to a two-stage series mechanical seal with controllable leakage.

Background

At present, in various fields such as petrochemical industry, thermoelectricity, nuclear power and the like, mechanical equipment is more and more sealed by adopting mechanical seals, and particularly, the application of integrated mechanical seals (a plurality of fast-assembly mechanical seals) is more and more extensive. However, the sealing is mostly single-stage, has a flushing water structure, and in many cases, the sealing effect is not good (because many media also have pollution to the environment and have high requirements on the sealing performance), the leakage rate cannot be controlled, and because of the limitation of the space structure and the economic limitation of the product, a complete set of three-stage fluid dynamic pressure mechanical sealing cannot be used like a nuclear main pump of a nuclear power plant, the design of a new mechanical sealing of a mechanical product which is suitable for the development of the industry at present is imperative.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a two-stage series mechanical seal with controllable leakage amount, and solves the problem.

In order to achieve the purpose, the utility model is realized by the following technical scheme: the technical scheme of the utility model is as follows: a two-stage series mechanical seal with controllable leakage comprises a pump shell, a shaft, a movable ring outer ring, a check ring, a round nut, a snap ring, a shaft sleeve, a first-stage fixed ring, a movable ring, a static ring outer ring, a static ring seat, a seal body, a second-stage fixed ring, a water retaining ring cover and a seal cover;

the shaft sleeve is sleeved on the shaft, the round nut is connected with the snap ring on the shaft sleeve, the second-stage fixing ring is sleeved on the shaft sleeve, the rotating ring is arranged on the second-stage fixing ring, a first O-shaped ring is arranged between the first-stage fixing ring and the second-stage fixing ring, a second O-shaped ring is arranged between the first-stage fixing ring and the rotating ring, a third O-shaped ring is arranged between the static ring and the static ring seat, a fourth O-shaped ring, a spring and an anti-rotating pin are arranged between the static ring seat and the sealing body, the static ring outer ring is sleeved on the outer ring of the static ring and the static ring seat, the rotating ring is sleeved on the outer ring of the first-stage fixing ring and the rotating ring, the check ring is clamped in the clamping groove of the rotating ring outer ring and is blocked at the outer side of the first-stage fixing ring, a fifth O-shaped ring is arranged between the sealing body and the sealing cover, a second O-shaped ring is arranged between the second-stage fixing ring and the rotating ring, install the retaining ring in the draw-in groove between solid fixed ring of second grade and the rotating ring outer loop, be equipped with fourth O type circle, spring and rotational lock between quiet ring seat and the sealed lid, be equipped with sixth O type circle, adjustment pad, snap ring and manger plate circle between the other end of axle sleeve and the axle, manger plate circle lid is installed and is covered sealed.

Preferably, the movable ring outer ring, the check ring, the first O-shaped ring, the second O-shaped ring, the movable ring, the static ring outer ring, the third O-shaped ring, the static ring seat, the anti-rotation pin, the fourth O-shaped ring, the spring and the fifth O-shaped ring are respectively provided with two sets.

Preferably, the seal is a combined seal structure formed by connecting two identical mechanical seals in series, the first-stage fixing ring, the moving ring outer ring, the check ring, the first O-shaped ring, the moving ring, the stationary ring outer ring, the third O-shaped ring, the stationary ring seat, the anti-rotation pin, the fourth O-shaped ring and the spring on one side form a first-stage seal, and the second-stage fixing ring, the moving ring outer ring, the check ring, the second O-shaped ring, the moving ring, the stationary ring outer ring, the third O-shaped ring, the stationary ring seat, the anti-rotation pin, the fourth O-shaped ring and the spring on the other side form a second-stage seal.

Preferably, the sealing body is provided with a sealing injection water hole and a sealing body drain hole, and the water retaining ring cover is provided with a leakage hole.

Preferably, a thread gap is formed between the sealing body and the outer ring of the moving ring of the primary seal, a thread gap is formed between the sealing body and the outer ring of the moving ring of the secondary seal, and a thread gap is formed between the water retaining ring and the water retaining ring cover.

Advantageous effects

1. The two-stage series mechanical seal with controllable leakage amount is equivalent to two-stage series seals which are assembled together according to the structural arrangement, and the two-stage series mechanical seal with controllable leakage amount can reduce pressure in sections and control leakage, thereby improving the sealing property and the reliability.

2. According to the two-stage series mechanical seal with controllable leakage amount, the first-stage seal fails, the second-stage seal still works normally and has sealing capability, and the sealed medium, such as flammable and explosive medium and harmful medium, can be effectively prevented from leaking outwards in a mode of injecting sealing water from the outside, so that accidents are prevented from happening, and the environment is protected.

3. The two-stage series mechanical seal with controllable leakage rate of the utility model designs one-way thread gaps between the seal body and the outer ring of the rotating ring and between the water retaining ring and the water retaining ring cover, and the gaps are like labyrinth seals and have the functions of throttling and guiding the medium, so that the pressure of the seal cavity is not too high.

Drawings

FIG. 1 is a schematic view of a two-stage tandem mechanical seal with controlled leakage according to the present invention.

In the figure: 1. a sliding table; 2. a slide base; 3. a chute; 4. a slider; 5. fixing the clamping plate; 6. a fixing plate; 7. a threaded rod; 8. a movable clamping plate; 9. an adjustment wheel; 10. a limiting block; 11. a jack; 12. a threaded hole; 13. a bolt; 14. inserting a rod; 15. a hole frame; 16. a limiting hole; 17. mounting a plate; 18. a pull rod; 19. a spring; 20. fixing the disc; 21. a limiting rod; 22. a handle; 23. a connecting member; 24. a concave inner surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): as shown in figure 1, a two-stage series mechanical seal with controllable leakage amount, as shown in figure 1, a two-end mechanical seal with controllable leakage amount, firstly a second-stage movable ring seat 19 is sleeved on a shaft sleeve 2, an O-shaped ring 10 is pressed into a seal groove of the second-stage movable ring seat 19, a movable ring 11 is arranged close to the second-stage movable ring seat 19, a movable ring outer ring 3 is sleeved outside the second-stage movable ring seat 19 and the movable ring 11, a check ring 4 is arranged in a groove of the second-stage movable ring outer ring 3 for clamping the second-stage movable ring seat 19, then a seal body 18 is sleeved on the shaft sleeve 7, one O-shaped ring 27 is pressed into a groove of the seal body 18, and the seal body 18 is fixed on a pump body 1.

Then in the primary seal, an O-shaped ring 17, a spring 20 and an anti-rotation pin 16 are arranged at corresponding positions according to the figure 1, a static ring seat 15 is arranged, an O-shaped ring 14 is pressed into a groove of the static ring seat 15, a static ring 12, a static ring seat 13 and a movable ring 11 are arranged, an O-shaped ring 10 and an O-shaped ring 9 are pressed into a corresponding groove of the movable ring seat 8, the movable ring seat 8 and the movable ring 11 are arranged together, a movable ring outer ring 3 of the primary seal is sleeved outside the movable ring 11 and the movable ring seat 8, after the movable ring outer ring is fixed by a check ring 4, the movable ring runner 8 is fixed on a shaft sleeve 7 by a snap ring 6 and then locked by a round nut 5.

According to the figure 1, the fixed ring outer ring 13, the fixed ring 12, the O-shaped ring 14 and the fixed ring seat 15 of the secondary seal are arranged together, the O-shaped ring 17, the spring 20 and the anti-rotation pin 16 are arranged at corresponding positions according to the figure 1, then an O-shaped ring 27 is pressed into a groove of the sealing cover 26, the sealing cover 26 is fixed on the sealing body 18, then the O-shaped ring 21 is placed in a groove of the shaft sleeve 7, the adjusting pad 22 and the clamping ring 23 are sleeved on the shaft 2, then the water blocking ring 24 is arranged, and then the water blocking ring cover 25 is fixed on the sealing cover 26.

The working process is as follows: as shown by the arrow in figure 1, the sealing injection water higher than the pressure in the pump shell 1 enters the primary sealing cavity from the hole 28, one part of the sealing injection water flows into the pump shell 1, one part of the sealing injection water flows into the secondary sealing front cavity after being depressurized, part of the sealing injection water in the primary sealing front cavity is discharged from the hole 29 on the sealing body 18, the other part of the sealing injection water enters the secondary sealing cavity, and the sealing water leaked from the secondary sealing enters the external liquid collecting tank through the hole 30 on the water retaining ring cover.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A two-stage series mechanical seal with controllable leakage is characterized by comprising a pump shell (1), a shaft (2), a movable ring outer ring (3), a retainer ring (4), a round nut (5), a snap ring (6), a shaft sleeve (7), a first-stage fixing ring (8), a movable ring (11), a static ring (12), a static ring outer ring (13), a static ring seat (15), a seal body (18), a second-stage fixing ring (19), a water retaining ring cover (25) and a seal cover (26);

the sleeve (7) is sleeved on the shaft (2), the round nut (5) is connected with the snap ring (6) on the shaft sleeve (7), the sleeve (7) of the second-stage fixing ring (19) is sleeved on the shaft sleeve (7), the rotating ring (11) is arranged on the second-stage fixing ring (19), a first O-shaped ring (9) is arranged between the first-stage fixing ring (8) and the second-stage fixing ring (19), a second O-shaped ring (10) is arranged between the first-stage fixing ring (8) and the rotating ring (11), a third O-shaped ring (14) is arranged between the static ring (12) and the static ring seat (15), a fourth O-shaped ring (17), a spring (20) and an anti-rotating pin (16) are arranged between the static ring seat (15) and the sealing body (18), the static ring (13) is sleeved on the outer rings of the static ring (12) and the static ring seat (15), and the rotating ring (3) is sleeved on the outer rings of the first-stage fixing ring (8) and the rotating ring (11), the retainer ring (4) is clamped in the clamping groove of the outer ring (3) of the movable ring and is retained at the outer side of the first-stage fixed ring (8), a fifth O-shaped ring (27) is arranged between the sealing body (18) and the pump shell (1), a fifth O-shaped ring (27) is arranged between the sealing body (18) and the sealing cover (26), a second O-shaped ring (10) is arranged between the second-stage fixed ring (19) and the movable ring (11), a retainer ring (4) is arranged in a clamping groove between the secondary fixed ring (19) and the movable ring outer ring (3), a fourth O-shaped ring (17), a spring (20) and an anti-rotation pin (16) are arranged between the static ring seat (15) and the sealing cover (26), a sixth O-shaped ring (21), an adjusting pad (22), a clamping ring (23) and a water retaining ring (24) are arranged between the other end of the shaft sleeve (7) and the shaft (2), and a water retaining ring cover (25) is arranged on the sealing cover (26).

2. The two-stage series mechanical seal with the leakage controllable according to claim 1, wherein the number of the rotating ring outer ring (3), the retainer ring (4), the first O-ring (9), the second O-ring (10), the rotating ring (11), the stationary ring (12), the stationary ring outer ring (13), the third O-ring (14), the stationary ring seat (15), the anti-rotation pin (16), the fourth O-ring (17), the spring (20) and the fifth O-ring (27) is two.

3. The two-stage series mechanical seal with the controllable leakage amount according to claim 2, characterized in that the first-stage fixing ring (8), the moving ring outer ring (3), the retainer ring (4), the first O-ring (9), the moving ring (11), the stationary ring (12), the stationary ring outer ring (13), the third O-ring (14), the stationary ring seat (15), the anti-rotation pin (16), the fourth O-ring (17), and the spring (20) on one side form a first-stage seal, and the second-stage fixing ring (19), the moving ring outer ring (3), the retainer ring (4), the second O-ring (10), the moving ring (11), the stationary ring (12), the stationary ring outer ring (13), the third O-ring (14), the stationary ring seat (15), the anti-rotation pin (16), the fourth O-ring (17), and the spring (20) on the other side form a second-stage seal.

4. A controlled leakage two-stage mechanical seal in series as claimed in claim 3 wherein said seal body (18) has a seal inlet hole (28) and a seal body drain hole (29) and said water deflector cover (25) has a leakage hole (30).

5. A controlled leakage two-stage mechanical seal in series according to claim 4, wherein the seal body (18) has a thread gap (31) with the moving ring outer ring (3) of the first stage seal, a thread gap (32) with the moving ring outer ring (3) of the second stage seal, and a thread gap (33) between the water deflector ring (24) and the water deflector cover (25).